We migrated the stack to Python 3 a year ago but we have been using a SCons that only works on Python 2.7. v3.0.0 SCons was released today and this allows us to use scons with our native python installation without having to have an additional external python. I have been testing the alpha releases and everything builds with this version of SCons (including ci_hsc). Upgrading to SCons3 will unblock a number of tickets relating to the CI builds and problems with python3 builds on operating systems that ship with Python2.6 by default.

This RFC proposes that we move to SCons3.